- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00815490
Validation of Brain Oxygenation Monitor
Calibration and Validation of the Nonin Non-invasive Cerebral Oxygen Saturation Oximeter and Cerebral Sensor in Human Volunteers
Study Overview
Detailed Description
This is a calibration and validation study of a near-infrared spectroscopy (NIRS) device designed to measure the cerebral tissue oxygen saturation non-invasively. This is achieved by comparing NIRS-derived cerebral tissue oxygen saturation with a calculated value derived from simultaneous arterial and jugular venous blood samples.
At present the FDA have adopted the standards published in 2005 by the International Organization for Standardization (ISO), entitled ISO 9919. This is a set of technical specifications and guidelines for pulse oximeters, which share certain technical similarities to cerebral oximeters. In particular, Annex EE details the conduct of a controlled desaturation study for the calibration of pulse oximeter equipment. Specifically, the fraction of inspired oxygen delivered to test subjects is varied to achieve a series of targeted steady state saturation periods over a range of arterial oxygen saturation of 70 - 100%.
While cerebral oximeters differ from pulse oximeters in terms of the what is being measured (brain tissue v arterial blood) the FDA have maintained the requirement to examine data from human volunteer studies in which the arterial oxygen saturation ranges from 70 - 100%. Two FDA-approved cerebral oximeters were validated in a similar manner.
The device controlling the inspired gas concentration is the RespirAct, which permits precise reduction in the arterial oxygen saturation while maintaining the arterial carbon dioxide level at 40 mmHg.
The study consists of 3 sequences:
- First sequence: reduction in arterial oxygen saturation in approximately 5% increments from 100 to 70% followed by return to room air and then a period of supplemental oxygen.
- Second sequence: reduction in arterial oxygen saturation in a single drop from 100 to 70% followed by return to room air and then a period of supplemental oxygen.
- Third sequence: reduction in arterial oxygen saturation in approximately 10% increments from 100 to 70% with alteration of carbon dioxide level from 35 to 45 mmHg at each interval followed by return to room air.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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North Carolina
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Durham, North Carolina, United States, 27705
- Duke University Health System
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- 21 to 35 years
- American Society of Anesthesiologists health assessment level 1
- Body Mass Index (BMI) 18 to 30
Exclusion Criteria:
- anemia
- hemoglobinopathy (e.g. sickle cell disease, thalassemia)
- positive pregnancy test (females)
- significant cardiac or pulmonary disease
- history of sleep apnea
- tobacco, drug or alcohol abuse
- difficult airway
- abnormal EKG / pulmonary function test / room air saturation
- intolerance to breathing mask apparatus
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Desaturation
Human volunteers undergo oxygen desaturation in order to determine the accuracy of the device over a clinical range of oxygen saturations 70 - 100%.
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Reduction in blood oxygen saturation by sequential reduction in inspired gas composition.
Steps are of 6 minutes duration with reduction in pulse oximeter oxygen saturation from 100 to 70%.
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Accuracy of Sensor
Time Frame: Data collected from individual participants over 1 hour timeframe. Data from cohort of subjects collected over 6 month period.
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A scatterplot is created with the forehead sensor saturation on the y-axis and the measured blood saturation on the x-axis.
The line of identity is drawn representing the ideal points, meaning that the forehead sensor saturation is always the same as the blood saturation.
The dispersion of the actual data points around this line of identity can be measured using a statistical calculation called Arithmetic Root Mean Square or ARMS.
The smaller the ARMS the closer the data points lie around the line of identity, representing a more accurate sensor.
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Data collected from individual participants over 1 hour timeframe. Data from cohort of subjects collected over 6 month period.
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Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: David B MacLeod, FRCA, Duke Health
Publications and helpful links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- Pro00002400
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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